Jill Biden, centre, wife of Vice President Joe Biden, sits with her sons Beau Biden, left, and Hunter Biden, right. Hunter separated from his wife in October 2015, five months after his brother Beau’s death

Former Vice President Biden confirmed the relationship to Page Six and said that he and his wife Jill Biden, have given their blessing to the couple.

In a statement, they said: “We are all lucky that Hunter and Hallie found each other as they were putting their lives together again after such sadness.

"They have mine and Jill’s full and complete support and we are happy for them.”

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Hunter, a lawyer who has three daughters - called Naomi, Finnegan and Maisy - with estranged wife Kathleen, also told Page Six: “Hallie and I are incredibly lucky to have found the love and support we have for each other in such a difficult time, and that’s been obvious to the people who love us most.

"We’ve been so lucky to have family and friends who have supported us every step of the way.”

Beau, the former attorney general of Delaware, and Hallie have two children, named Natalie and, confusingly, Hunter.